Sewing-machine



4 Sheets-Sheef 1.

(No ModeL) T. E. & 0.11. COLBY.

SEWING MACHINE.

No. 584,328. Patented June 15,1897.

INVE U sJ, ($4 flaw (No Model.) r I 4 SheetsSheetI2.

T. E. 8v G. H. COLBY.

SEWING MACHINE.

No. 584,828. Patented June 15,1897.

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T. E. 8t 0. H. COLBY. SEWING MACHINE.

No. 584,328. Patented June15, 1897.

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4 Sheets-Sheet 4.

(No Model.)

T. E. & G. H. COLBY.

SEWING MACHINE.

No. 584,328. Patented June 15,1897.

/ N VE N 70195 W/T/VESSES lhvirnn Sra'rns Prijnr Prion.

THOVAS E. COLBY AND CHARLES ll. COLBY, OF BROOKLYN, NEW YORK, ASSIGNORS TO JAMES T. LAW, OF TARRYTOXVN, NEW YORK.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 58%,328, dated June 15, 1897.

Application filed March 2, 1887. Serial No. 229,635. (No model.)

To aZZ whom it may concern.- tonhole-stitching is completed, and the brake Beit known that we, THOMASE. COLBY and U on the tripping-rod U, brought into the CHARLES H. COLBY, citizens of the United path of the swelln on the fast cone-pulley N, States, residing in Brooklyn, in the county of so as to stop the stitching mechanism, areall 55 5 Kings and State of New York, have invented common to the Wheeler & WVilson buttona new and useful Improvement in Button hole-sewing machine, style No. 10, above rehole-Machines, of which the following is a ferred to, so need no further description here specification. in. The cutter I and cuttenbar I, which The object of our invention is to so conslides in vertical bearings in the head C and 60 struct a buttonhole-sewing machine that it partially turns when it descends, are also the will automatically cut the buttonhole when same as in the Wheeler & lVilson machine the sewing is completed, utilizing for this referred to. purpose the momentum ofthe machine, which For depressing the cutterbar 1 We prefwould otherwise be unavoidably 10st in sto erably mount an additional rock-shaft F hori- 65 ping the machine to commence sewing the zontally in bearings E and f 011 the overhangneXt buttonhole. ing arm B of the machine, said rock-shaft The invent-ion consists of certain novel having crank-arms H and G on its front and combinations of parts, substantially as hererear ends, respectively, and connect the front inafter claimed, and in order that our invencrank H with the cutter-bar I by means of a 70 tion may be fully understood we shall before loose block 7L3, sliding in a slot in the crank specifically claiming the same set forth in de- H, and secured together with an outer retaintail the mode in which the same may be car'- ingplate 7t by a pivot-screw h to a part of ried into effect. the cutter-bar I between collars 2', as clearly Reference is to be had to the accompanying shown in Figs. 5, 6, and 7, so as to cause the 75 drawings, formingapart of this specification, cutter-bar to descend when the shaft F is in whichrocked. We further connect the rear end Figure 1 is a rear elevation of a buttonholecrank G by a long pivot-pin g with a loose machine embodying our invention. Fig. 2 is block 9 adapted to slide on said pivot-pin an end view of a portion of the same showing and in a slot in the arm P of a lever P, which 80 0 the working parts. Figs. 3, 4, 5, 6, and 7 are is both pivoted to turn on and adapted to slide detail views of parts hereinafter referred to. lengthwise of a spindle O, projecting hori- Fig. 8 is a front elevation of part of the said zontally from the overhanging arm B, so that machine. Fig. 9 is a detail plan View of part on swinging said lever P the shaft F will be of the tripping device of the same. rocked and the cutter I depressed to cut the 8 5 Like letters and numerals of reference desbuttonhole in a well-known manner.

ignate corresponding parts in the various fig- For swinging the lever P, and thus depressures. ing the cutter I by the action of the nee- We have herein for the sake of example clle-bar-actuati11g mechanism, we provide in shown our invention applied to an ordinary this instance the face of the outer fast cone- 9o Wheeler dz Vilson buttonholesewing mawheel N with a circular hub n and inside chine, No. 10. The bed-plate A, overhangthereofacam WV, the bearing-surface of which ing arm B, head C, rotary driving-shaft D, forms in this instance a circular segment cofast and loose cone-pulleys N and M, main incident with the hub 01 for about two hundriving-pulley K, shifting-pulley L, pitman dred and seventy degrees, and then, an evo- 95 T, needlebar-actuating rock-shaft V, the lute curve of aboutninetydegrees rising gradneedle-bar and stitchforming mechanism, ually from the circular curve, but terminat- (not shown,) the work-clamp 1, the work ing abruptly in aradial shoulder. This cam clamp-operating mechanism 2, the tripping engages a follower connected with the cutterdevice 3, operated thereby, by which the conedepressing mechanism, as the curved arm P I00 pulley M is automatically shifted and disof the lever P, which has a concave P and engaged from the cone-pulleyNwhen thebutnormally rests on the circular hub of, so as lute portion thereof.

shown'as consisting of a spring-actuated rod,

R, working vertically in the fixed bearings E e and having an arm r pressing upward against a cam-like projection P on the arm P of the lever P.

To control the coaction of the cam W and follower P from the clamp-operating mechanism 2, so as to secure the automatic depression of the cutter L when the stitching is completed, We in this case provide the inner loose cone-pulley M with an annular groove m, in which is seated loosely a short arm P of the lever P, so that when the loose cone-pulley M is automatically moved inward out of engagement with the fast cone-pulley N at the completion of the buttonhole-stitching by the action of the work-clamp-operating device 2 on the tripping device 3 in the ordinary manner the lever P will be simultaneously shifted inward without affecting the operative relation of the follower P and the cutter-depressing mechanism and said follower, which before rested on the circular hub n? outside the cam W, brought into the circular part of said cam in the path of the evo- Then, although the revolving fast cone-pulley N is no longer engaged by the driving conepulley M, its momentum will cause it to continue its revolution and its cam V to consequently operate the follower P and depress the cutter until as the terminal shoulder of the cam permits the follower P and cutter I to be retracted the swell n is engaged by the brake U on the tripping-rod N, which has been drawn inward, as before described, and the machine thus stopped.

Then, in again starting the machine to form the next buttonhole, the loose drivingpulley M is forced outward against the fast pulley N, as by the tripping-rod and common knee-latch in the usual manner, the follower P will be simultaneously shifted outward beyond the path of the evolute portion of the cam, so that the cutter will be unaffected by the operation of the stitch-forming mechanism until the completion of the same, asbefore described.

What we claim is In a buttonhole-sewing machine, contain ing a stop-motion whereby the sewing mechanism is disconnected from the source of power at or near thetermination of the buttonhole, in combination with said stop-motion, a buttonhole-cutter and connections between said b uttonholecu'tter and said stop-motion whereby said cutter is thrown into action by the movement of said stop-motion, but is per mitted to remain inactive until said stop-motion moves, substantially as described.

THOMAS E. COLBY. CHARLES H. COLBY. Witnesses:

J. H. COLBY, JOHN M. STEARNS. 

